The information you seek is likely in the Chassis and Body parts catalog for the 1959 Mercury models. A lot of the old original manuals included multiple years, I believe the manuals were from 1956 through 1959 in the paper book versions. A lot of this type stuff is recorded on CDs now days.
Most of my mercury stuff is for the early 49 thru 51 models but I also have stuff up to 1955 which is no help for a 1959 model.
Ford didn't use buck tags in the earlier part of the 1950s. Everything was on a body data plate which could be inside the cab or in a door jam on some. Under hood tags were used in the early 50s.
Body tags generally give the body type & manufacturing date codes as well as interior and exterior color & materials combinations. Some give engine, transmission, & rear axle information.